Adventurous. Alone. Attacked.

Carla Stefaniak did everything “right,” her best friend said. On a five-day vacation to Costa Rica in November to celebrate her 36th birthday, Ms. Stefaniak, a dual Venezuelan-American citizen, chose a gated Airbnb villa near the airport. It had a security guard. It was in a safe neighborhood. And she made sure to get home…

36 Hours: 36 Hours in Hoi An

Situated on the coast of central Vietnam, the former commercial port of Hoi An offers endless wonders, from fishermen launching bamboo basket boats along palm-fringed beaches, to farmers in conical hats harvesting rice in swathes of green paddies. But the marquee attraction is the well-preserved ancient town, brushed mustard yellow and festooned with colorful silk…